The Panasonic Leica DG Summilux 25mm f/1.4 ASPH is a new standard lens for the Micro Four Thirds compact camera system. Providing an effective focal length of 50mm, a fast maximum aperture of f/1.4 and a Nano Surface Coating to help reduce flare, the Leica-branded Panasonic 25mm lens is small in both size and weight. Read our Panasonic Leica DG Summilux 25mm f/1.4 ASPH review to find out if this long-awaited premium optic is a must-have Micro Four Thirds lens.